Adjustable back for stools.



PATENTED NOV. 28, 1905.

C. O. AUGUSTINE. ADJUSTABLE BACK FOR STOOLS.

APPLICATION FILED JAN. 9. 1905.

5 is a bottom viewof the back-piece.

UNITED STATES PATENT OFFICE.

CHARLES C. AUGUSTINE, OF CEDAR RAPIDS. IOl/VA, ASSIGNOR OF ONE- HALF TO A. E. MULFORD,

OF CEDAR RAPIDS, IOWA.

ADJUSTABLE BACK FOR STOOLS.

Specification of Letters Patent.

Patented Nov. 28, 1905.

To all whom it may concern:

Be it known that 1, CHARLES C. AUGUSTINE, a citizen of the United States, residing at Oedar Rapids, in the county of Linn and State of Iowa, have invented certain new and useful Improvements in Adjustable Backs for Stools, of which the following is a specification.

The object of this invention is to provide a simple back for piano and other stools adapted for perfect adjustment to the occupant of the stool and so constructed as to be easily and quickly attached or detached and folded into small space to be carried in the hand or pocket.

.The nature of the invention will fully appear from the description and claims following, reference-being had to the accompanying drawings, in which- Figure 1 is a side view of a device embodying my invention as in use. Fig. 2 is a similar view of the same folded, but with the backpiece detached. Fig. 3 is a central longitudinal section of the same. Fig. A shows a back-supporting rod in a single piece. Fig. Fig. 6 is an end view of the bolt which clamps the back-rod to its supporting-arm. Fig. 7 is a view from the side adjacent to said rod of a clamping-Washer cooperating with the clampbolt. Fig. 8 is a view of the clamp as seen endwise of the rod, the bracket being supposed cut off a little to the right of the clamp in Fig. 3.

' In the drawings, A designates a piano-stool of a familiar type, having the usual screw B for raising or depressing the seat. In some stools to which the device is applicable the screw is not used, but the corresponding part is a mere pivot-iron attached to the seat, the shank of which pivot is in some cases rectangular in cross-section.

To the screw is clamped a slotted arm O, provided with a seat or recess D, preferably angular, to take on one side of the seat-pivot, whether round or rectangular. Opposite this is hinged a counter-plate E, pivoted in-lugs F, formed on the body of the arm O. As the seat-pivots vary somewhat in diameter the lugs are preferably provided with extra holes and the pin G is made removable, so that the counter-plate may be adjusted according to the size of the seat-pivot or standard. Opposite the lugs, near the end of the arm, a thumbscrew H is loosely secured in a hole in the arm, as by a pin I. The opposite hole in the counter-plate is screw-threaded to fit the thumb-screw, and by a few turns of the latter the clamp is tightened or released at will. The outer end of the arm is slotted at J, and in this is mounted a clamp for the back-rod K. This clamp consists of a washer L, having a shoulder at L to slide in the slot, and a central hole L for the stem M of the clamp-bolt M. It is also counterbored at L for a reduced portion of the clamp-bolt M A hole through this reduced part or neck takes the back-rod, which is clamped in any desired position by a thumb-nut N on the clamp-bolt, drawing the bolt and the inserted rod tightly against the washer, which is provided with recesses L* to receive one side of it. These are placed at right angles to each other, so that the rod may stand upright, as shown in Fig. 1, or parallel with the arm, as shown in Fig. 2.

In order to fold the device into small compass, the back-i'od is hinged at K, and this admits of its folding up, as shown in Fig. 2. In Fig. 4 I have shown the rod in a single piece.

To the upper end of the rod is attached a back-piece O, having a hole O to take the end of the rod. This back may be a simple piece of wood suitably formed with a hole bored partly through the boss O Being free to turn, the back yields freely in either direction to the movement of the occupants body, while at the same time furnishing afirm and restful support thereto.

In Fig. 1 the arm or bracket O is shown with an offset at O to bring the body thereof close up under the stool. When the seat-spindle has little or no hub, this may be dispensed with, as shown in Fig. 2. It will also be noted that the body of the arm is ofifsetlaterally, so as to bring the back-rod central with respect to the seat-spindle.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. An adjustable back for stools, comprising a bracket adapted to be clamped to the stoolseat spindle, and having an outwardly-projecting portion with a straight slot therein, a shouldered clamp adapted to slide in said slot and to hold the back-rod at a predetermined angle to the bracket, a back-rod transversely movable in said clamp, and a back-piece mounted at the upper end of said rod.

2. An adjustable back for stools, comprising a bracket adapted to be clamped to the seatspindle, and having a straight slot in its outer portion to take a back-rod clamp, a shouldered clamp adapted to slide in said slot and to hold the back-rod at a predetermined angle to the bracket, and, when loosened, permit the back-rod to fold parallel with the bracket, a jointed back-rod, and a detachable back-piece mounted revolubly on said rod at the upper end.

3. In combination with a back-supporting rod and a bracket adapted for attachment to the spindle of a stool-seat, a clamp, comprising a bolt with a hole through it to take said rod, a thumb-screw for the threaded end of 5 said bolt, and a washer adapted to engage the bracket without turning, and having recesses disposed at practically right angles, to take one side of said rod, whereby the rod may stand at right angles to, or parallel with said bracket.

In testimony whereof I aflix my signature in presence of two witnesses.

CHARLES C. AUGUSTINE.

WVitnesses:

J. M. ST. JOHN, AI-IEART :MIELSA. 

